trainload vs loading

trainload and loading both are nouns.

Word	Noun	Adjective	Verb	Adverb
trainload	Yes	No	No	No
loading	Yes	No	No	No

As nouns, loading is a hypernym of trainload; that is, loading is a word with a broader meaning than trainload:

Other hypernyms of trainload include load.

trainload (noun)	loading (noun)
quantity that can be carried by a train	the labor of putting a load of something on or in a vehicle or ship or container etc.
	goods carried by a large vehicle
	weight to be borne or conveyed
	a quantity that can be processed or transported at one time
	the ratio of the gross weight of an airplane to some factor determining its lift