Yes, RAILHEAD is a Scrabble word!

Letter values in Scrabble US: R 1, A 1, I 1, L 1, H 4, E 1, A 1, D 2.

Is it a valid word?

RAILHEAD is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a railroad depot in a theater of operations where military supplies are unloaded for distribution
the end of the completed track on an unfinished railway