Some basic lore for ya'll: The year is 1958, a new rail line has just been built, 3 coaches, 8 trucks, 1 locomotive. That locomotive is Betsy. Betsy led the railway until 1969 when the railway bought three new engines, Fox, Wolf, and Maine. Fox, a Mason Bogie Tenmile painted Navy blue with golden boiler bands, Wolf, an old 4-4-0 from the early days of American Railroading, and Maine, a D&RGW Class 48. Maine is typically the grumpiest due to being the main Heavy goods engine, Wolf is the express engine, Fox is used for locals and slower goods, and Betsy takes out excursion trains. Altogether the engines get along very well and always welcome new engines with open arms, well, maybe except for Maine, but he's like that to everyone ;)
If you wish to add a locomotive of yours please just ask in the comments of the studio ;D