Train is referring to one or more engines coupled with or without rail cars.
See also:
"Train" is in the NAICS Code "33635"
Motor Vehicle Transmission and Power Train Parts Manufacturing
"Train" is in the UNSPSC Code "25171603"
Train defrosting or defogging systems
Ref: 124278/2006-10-01
Other Database Pages Exist for this Phrase:
Cow Trainer (A Cow Trainer is a tin or wire structure. ..)
Gear train (Gear train is two or more gear working together ...)