A/N: So, I guess this chapter's a little short compared to the rest that I've written so far, but the next one should make up for that. This one's also pretty chill, but I have another OC introduction here. I hope you like her; she's based off of a real life engine that's a personal favorite of mine.

It was a pleasant day on the Island of Sodor. Thomas was puffing up Edward's Branch Line with a happy smile on his face. His grin grew even larger when he saw the Scottish Twins, Donald and Douglas, heading in the opposite direction on the other track.

Donald spotted the tank engine first and whistled to him as he slowed down. "Hello, Thomas! Ye look verra happy today."

Thomas smiled. "I am, Douglas! Are you two headed down to Brendam Docks?"

The Number 9 engine chuckled as he shared a knowing look with his twin. "Actually, Thomas, ah'm Donald. Aye, we're headed down to th' docks. More work tha' needs tae be done."

Thomas's eyes twinkled mischievously. "Something tells me that you'll be finding more than just work there…" He failed to hold back a giggle.

Douglas's smile faltered. "Whit are ye talkin' about?"

"A new tender engine just arrived here from Scotland. From what I could tell, they looked a lot like you both, too. Cranky hadn't unloaded them yet, so I didn't get to see very much of what they looked like."

The twins were speechless. They glanced at each other in shock and were silent for a while.

Finally, Donald asked, "...Yer sure it looked jist like us?"

"Pretty sure." Thomas watched as they fell silent and stared at the tracks in front of them. "Why? Aren't you excited to see one of your siblings? I know I would be if I found out that one of them was still alive and wanted to see me." His last sentence was spoken with a trace of sorrow.

Douglas's eyes darkened. "Yer siblings were scrapped, too?"

"Yes… They were." A lightbulb came on inside of Thomas's funnel. "...Is that why you're so surprised to hear about this engine?"

"Aye. Our brothers an' sisters were bein' scrapped left an' right when Donnie and ah left Scotland tae come tae Sodor."

Donald sadly looked away. "...We never even got tae say goodbye tae any of them b'fore we left… Only th' Great Railway Above knows whether or nae any o' them survived."

"I see." Thomas wasn't sure what else to say, so he gave them a sympathetic smile and whistled. "Well, good luck. I really hope it's one of your brothers or sisters that I saw." He began to puff away.

"So do we, Thomas," said Douglas. "So do we."

The Scottish twins started to move again as Thomas faded out of sight.

After a few minutes had passed between them in heavy silence, Donald looked up at his brother. "If it really is one o' our siblings, Douggie, who do ye think it is?"

"Hard tae say." The Number 10 engine sighed. "Though, if ah had tae guess, ah'd say it's one of th' younger engines, but then agin it could be a hard-workin' one of our much older siblings. Like Calumina, or Fingal."

"There's nae way Caley could've made it. She's th' oldest of us all, an' fer all we ken, she might've been one o' the first tae go."

"Or one of th' last. 'The first shall be last,' ye ken."

Donald sighed. "We kin only hope…"

Douglas stared at the track ahead. "We kin only hope tha' we're nae too late and th' engine's already left fer their job."

"Whit?"

His twin suddenly shot forward. "Race ye there, Donnie."

Donald was after him in an instant. "Yer on!"

A few minutes later, the twins reached Brendam Docks.

"Ah won!"

"You didnae! Ah won!"

"Nae, ah won!"

"Nae, ah won!"

As Donald and Douglas rounded the bend, they came within sight of Cranky, and the twins stopped arguing and came to a complete stop when they saw who he was lowering onto the rails.

A beautiful dark blue tender engine shaped just like the Scottish twins was carefully being aligned onto the track beneath her. When the engine's eyes met theirs, she gasped and stared at them for a long time.

It was Donald who finally broke the silence. "...Sister? Is that ye?"

"...Donnie? Douggie?" she whispered.

Tears began to well up in each of the siblings' eyes.

The female engine started to cry. "Ah thought ah'd never see ye agin! Especially ye, Douggie! Ah thought ye'd been scrapped!"

"Ah wasnae goin' tae leave mah brother's side," said Donald with a tearful smile. "Of course ah brought him wit' me."

Douglas's eyes trailed downward. "O' course... ah almost did get..." He shuddered. "It was a close call."

The female engine gazed at him with sympathy in her eyes.

Suddenly, Sir Topham Hatt walked up to the trio and cleared his throat to catch the engine's attention. "Excuse me, are you the new engine from Scotland that I requested?"

She tried to stop her tears from flowing and smiled at him. "Ah believe so, sir. Ah'm ken as Calumina back in Bonnie Scotland."

Sir Topham Hatt nodded. "Excellent. I'm here to direct you to your new job. You will be working primarily on the Main Line, hauling goods trains."

"Aye, sir! Ah'm ready tae go when ye are."

Calumina smiled at Donald and Douglas as Sir Topham Hatt climbed into her cab alongside her driver and fireman. "'Tis so nice tae be seein' ye agin... mah wee brothers."

Donald smiled back and tried to stop more tears from rolling down his cheeks. "It's nice tae see ye too... Caley."

Calumina giggled shyly at hearing him call her by her nickname, and with a chirp of her whistle, she puffed away.

The twins watched her go, then Douglas sighed and started to move, too. "Best we be movin' on tae our next job, Donnie."

"Aye."

The Scottish brothers got back to work, happy that they could be reunited with their older sister.

Calumina had only been on the island for several hours, but by then, she was already conversing with some of the other engines as if they had been friends all their lives.

"...And I'm just so glad that I can finally meet some engines that accept me for who I am, and not what I am," Eithne was saying to the Scottish engine as they sat next to the water tower at Wellsworth.

Calumina smiled gently. "Aye, tha's whit really matters, is an engine's heart. We may be different kinds of engines, but who we are on th' inside is whit counts."

Eithne's driver walked up to the two girls. "I hate to interrupt your conversation, but we have to take care of our last jobs for the day now, Eithne, and we can't be late."

The Irish engine smiled sadly at her new friend. "It's been so nice to talk with you, Calumina. Take care, now."

Calumina whistled as she watched Eithne go, still pondering over their conversation. A pair of deep-toned whistles disrupted her thoughts, and she looked up to see her twin brothers coming towards her.

"Are ye doin' anything right now, Caley?" asked Douglas.

"Nae. Are ye?"

"Och aye, we're comin' tae git ye and bring ye back tae our friends so we kin properly introduce them tae ye."

Their sister smiled. "Ah would love that!"

As the three Scottish siblings headed down the Main Line together, Calumina closed her eyes as she felt the breeze on her face and soaked in the peaceful ambience that surrounded them.

After a few moments, she opened her eyes again and sighed. "Ah'm so glad tae be with ye agin, Donnie an' Douggie. When ah realized tha' ye had both disappeared, ah asked our auld controller where ye'd gone, an' he told me tha' Donnie had been sold an' sent off tae th' Island o' Sodor, an' that Douggie was goin' tae be scrapped… but nae a person could find ye anywhere, nae even at th' scrapyard."

Douglas turned pale at the mention of scrap, but he took a deep breath and asked her, "So, all of our siblings… Are… they…?" He couldn't bring himself to finish the question.

Calumina's eyes lowered with sadness. "Aye… all o' them are gone." She held back tears that threatened to fall. "It's jist us now."

There was a silence between the three that was thick with sorrow. Donald and Douglas made eye contact with each other as they realized just how lucky they were to both get away and remain on Sodor together, and now they were even luckier to have their only remaining sister with them on the island.

Their spirits lifted when they reached the Little Western and made their way to Tidmouth Hault. The sun was beginning to set, and the other engines were coming back to the sheds for the night. A certain iridescent tender engine was pulling into her berth as the trio approached Tidmouth Hault Sheds.

"Who's th' bonnie lassie?" Calumina asked her brothers.

Douglas smiled fondly. "Och, that's Michaela. She's been on th' island fer almost a month now, an' she works in the shunting yards here on the Little Western." His voice softened. "She's verra kind, and she's also a great singer."

Calumina glanced back and forth at him and Michaela, and her face suddenly broke out in a huge grin.

Douglas's face turned red when he realized what his sister was thinking. "Och, Caley, 'tis nae like that..."

She raised an eyebrow. "Hm now, ah wonder where ah've heard tha' b'fore…"

The Number 10 engine watched her puff towards Michaela to go introduce herself, and he suddenly realized what Calumina had said to him. Where had she heard that before?

Douglas squeezed his eyes shut as memories that he had been holding back for too long suddenly began to creep into his mind. Go away, go away, go away… he thought desperately as he tried to push them back.

"Douglas? Brother, are ye alright?"

Donald's voice snapped the Scottish engine out of his trance, and he hesitated before giving his twin a small but confident smile. "Aye, ah'm fine."

The twins steamed towards the sheds, where their older sister was talking with Michaela.

"Donnie, Douggie," said Calumina as they were about to go onto the turntable to get to their berths, "this wee lass is jist so sweet an' innocent. Can ah keep her?"

"Whit are ye talkin' about, Caley?" asked Donald.

"Let me rephrase tha'. Can we adopt her as our new sister?"

"Whit on earth would ye wan' tae do tha' fer?" Douglas asked her.

Michaela watched them with a helpless but amused look on her face.

"She's jist like th' little sister that ah never had. Can we keep her, please?" Although Calumina was joking, she almost sounded like she wasn't.

"But ye had plenty o—"

Donald cut off his twin with a harsh whisper. "Nae now, Douggie. Especially since those sisters are nae alive anymore."

Duck and Oliver's whistles prevented Douglas from giving his brother a grim reply.

"Duck, Oliver, Toad, this is our sister, Calumina. She jist arrived here on Sodor."

"Oh? I didn't know you had a sister," said Duck as he settled into the sheds. "Hello, Calumina."

Oliver stared at her in amazement as he backed Toad into his berth. "Wow… You look so much like your brothers."

Calumina smiled fondly as she glanced at the twins. "Aye, ah do. Sometimes th' other engines back in Scotland called me their triplet sister." She closed her eyes, recalling the days when the three of them had all lived together in their home country. "Ah didnae see mah twin brothers verra often, but when ah did… we had th' best o' times together."

Calumina opened her eyes. "Ye two always had so many pranks tae play on people. Ah still remember th' day our brother Gregor woke up actin' rather loopy like, an' it was because ye two had gotten yer drivers tae pour some Scotch into his tank…"

"It was butterscotch-flavored soda," Douglas corrected her with an embarrassed blush on his face.

"So that's what soda is…" Michaela muttered to herself beside him.

Calumina continued with a smile. "Ah'm really jist so glad tae be wit' ye agin, Donnie an' Douggie… mah two youngest brothers."

"And we're glad tae be with ye tae, Caley," said Donald.

The engines all talked together until it was dark outside, and then the time came for Calumina to leave for the night.

"Ah'll see ye tomorrow, lads!" she called to her brothers as she slowly pulled away from Tidmouth Hault Sheds.

"Goodnight, Calumina!" the twins called after her.

As the engines began to settle down for the night, Donald glanced over at Oliver and noticed something strange. "Losh sakes, Oliver, yer face is awful red."

"It is?" The Great Western tank engine blushed even more and rolled back inside his berth. "Oh, dear…"

The other engines chuckled, and one by one, they all dropped off to sleep.

Meanwhile on the Main Line, Calumina was silently puffing down the track with a thoughtful look in her eyes. She looked up at the stars and inhaled the crisp night air as she thought of Scotland, the land she had lived in for so many years.

Then Calumina's thoughts turned to her little brothers, and she smiled fondly as she realized that now she would be able to see them any day that she wished, and they would all live together on the Island of Sodor.

Calumina's eyes welled up with tears. Sodor. Her new home. It wasn't anything like her old one, but that was alright. As long as she could be with Donald and Douglas, everything would be just fine.

A/N: Calumina is based off of #828, the last surviving member of the Caledonian Railway 812 class (the same basis as Donald and Douglas—which, of course, makes them siblings). 828 was the first of the class to be built, and interestingly enough, Donald and Douglas's former numbers (57646 and 57647) make them the youngest out of their class (but their numbers would realistically place them in the 652 sub-class).