Atlas N 40005121 DCC Sound Union Pacific UP #1602B FB-1 Diesel Locomotive August 18, 2026 By 0 At the height of cab units, this was ALCOs foray into the market. Over 600 were built from 1946 to 1956 with 400 of them being FA units. DCC equipped. Dual mode DC and DCC operation. Supports all DCC programming modes.