Badger Air Brush Co
Modelflex Paint

Southern Pacific Scarlet Red
Walthers Part # 165-1637, p. 835 Walthers 2012 HO Scale Reference
A scale, $3.40, not currently in stock at Walthers, Expected: Unknown

 
Specially formulated for models, goes on super thin (.25 to .50 thousands) to color without hiding fine details. Non-toxic and with no foul odor. Modelflex cleans up with water and can be sprayed or brushed.