This article is about 'the characters'. You may be looking for 'the episode or the Story Library book'.

Mighty and Mac are a double-ended Fairlie duplex locomotive, and conjoined twins. Mighty is the "older" of the two and is distinguished by a small flick of hair. Mac is the "younger" half and is distinguished by his youthful features, round nose and freckled cheeks.

Despite the opposing personalities of the two ends, they are technically one engine.


Thomas & Friends

Prior to their adoption into the Skarloey Railway family, Mighty Mac had only worked in the shunting yards. Their lack of knowledge beyond their boundaries created much conflict between the two halves (for example, which end is in charge of doing what) when they pulled their first train, which placed themselves and their passengers in great danger whilst running an important errand. But, with advice from Thomas in mind, they were able to complete their task and realise the value of working as one.


Mighty Mac is two engines in one. He is Mighty on one end and Mac on the other-- making him one of the most unusual engines working on the Skarloey Railway. When Mighty and Mac work together, Mighty Mac is the strongest engine on the Railway. But when they don’t, Mighty and Mac pull each other backwards and forwards, only to end up right where they began.

Technical Details


Mighty Mac is based on a Double Fairlie locomotive of the Ffestiniog Railway with added buffer beams. Livingston Thompson from the same railway appeared in the 1979 Annual and is preserved at the National Railway Museum. Three more of these are currently in service on the Ffestiniog - and another is under construction at Boston Lodge.


Mighty and Mac are painted royal blue with yellow and red lining. On Mighty's side, his cab windows and tank caps are lined with yellow, while on Mac's side, they are lined with red.


Audio Files



First used Last used Sound Effect
Series 9 Series 9
Bert's Whistle
First used Last used Sound Effect
Series 10 Series 10
Sir Handel's Whistle CGI
First used Last used Sound Effect
Series 11 Series 12
Mighty's Whistle



First used Last used Sound Effect
Series 9 Series 9
Rex's Whistle
First used Last used Sound Effect
Series 11 Series 12
Mac's Whistle


  • Mighty is the only engine to have what appears to be hair (excluding facial hair).
  • Mighty Mac has used two whistle sounds in the television series. Also, they have a whistle at both ends of their model unlike most Double Fairlies.
  • Mighty's original whistle sound was later used for Bert and Rebecca.
  • Mac's original whistle sound was later used for Rex.
  • Out of all the characters introduced in the ninth and tenth series, Mighty Mac is the only one to not be mentioned in the song, "There's Always Something New."
  • In the German dub since the tenth series, Mighty Mac has been called Big Mac, which is also the name of a TUGS character and a hamburger sold by the fast food restaurant McDonald's.
  • Mighty's hair changed position on his face masks, depending on what emotion he was expressing.
  • Mighty Mac is the first narrow gauge character not to have a small-scale O gauge model.


* RWS only | ** T&F only

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