HO Scale Model Railroad Freight Car Construction Tips:

Intermountain Railway Company Cylindrical 4-Bay Covered Grain Hopper
Intermountain Railway Company 4750 Cubic Foot 18 Rib 3-Bay Covered Hopper
Intermountain Railway Company ACF Type 27 8,000 Gallon Riveted Tank Car
Intermountain Railway Company PS-1 40 Foot Box Car
Life-Like Proto 2000 4427 PS2-CD High-Side Covered Hopper
Life-Like Proto 2000 AAR 50 Ton Flat Car
Life-Like Proto 2000 50' Single Door Box Car with 5/5 Dreadnaught Ends
Life-Like Proto 2000 52' 6" Drop End Mill Gondola
Red Caboose General Service Steel Side Drop Bottom Gondola

Photos courtesy of Intermountain Railway Company, Walthers and Red Caboose