Locomotive is red, key-holed flatcars are yellow and orange, pegged flat car is blue, and last car is green with green box and one intact Type 3 decal (dt3). One of the green couplers is missing.
This single-color box car seems to be the earlier version in the catalogs (until 1938). See Holgate #1035 "Baby Train" in box for the 1940 multi-color version.