as car heights increased significantly and cupolas became less and less useful

Here is an Atlas 48346 N Scale D&RGW GP9 Diesel Locomotive #5941

Trainz Product Id: 11589925

Here is a Broadway Limited 5815 HO Scale Northwestern Pacific EMD SD9 Diesel Locomotive #4423 w/Sound & DCC

Model Number: 29801

Fleischmann 931485 Cargo Digital N Gauge Diesel Freight Train Set ProductID_12112074 as car heights increased significantlyThis is a Fleischmann 931485 N Scale Digital Starter Set Freight Train and Diesel Locomotive, SBB Cargo. Contents: 1 Diesel locomotive class 203 with load sensing decoder and light change according to the direction of travel. LED headlights. 3 container wagons, 1 FLEISCHMANN Multi Maus, 1 transformer, 1 amplifier, 7 straight tracks (3 x 9100, 3 x 9101, 1 straight power feed track), 8 curves 9120, 2 decoupling tracks 9114, 1 left curve 9168, 1 right