Close-coupled

Great Northern Railway outer-suburban passenger train of close-coupled four-wheel coaches, hauled by Ivatt 4-4-2 tank locomotive painted grey with white lettering in 1915, as a wartime measure

Actually, as built, these were the motive power ends of two passenger railcars, each being close-coupled to a driving trailer which had only one axle at the locomotive end and a bogie at the other.