Editing 4-6-4 (section)

===Tank locomotives===
The 4-6-4T was also a fairly common [[wheel arrangement]] for passenger [[tank locomotive]]s. As such, it was essentially the tank locomotive equivalent of a {{nowrap|[[4-6-0]]}} tender locomotive, with water tanks and a coal bunker supported by four trailing wheels instead of in a tender. In New Zealand, some 4-6-4T locomotives (the Wab class) were tank versions of [[4-6-2]] locomotives (of the Ab class).

The first known 4-6-4 tank locomotive was rebuilt from a [[Natal Government Railways]] (NGR) [[South African Class C 4-6-0T|K&S Class]] [[4-6-0|4-6-0T]] which was modified in 1896 to enable it to run equally well in either direction on the [[Colony of Natal|Natal]] South Coast line, where no turning facilities were available at the time. This sole locomotive later became the [[South African Class C2 4-6-4T|Class C2]] on the [[South African Railways]] (SAR). The first known locomotive class to be designed with a 4-6-4T wheel arrangement, the NGR's [[South African Class E 4-6-4T|Class F]] tank locomotive, was based on this modified locomotive and built by [[Neilson & Company|Neilson, Reid & Company]] in 1902. These became the Class E on the SAR in 1912.<ref name="Holland 1">{{Holland-Vol 1|pages=87–89, 96–98, 127–129, 135–137}}</ref><ref name="Paxton-Bourne">{{Paxton-Bourne|pages=23, 28–30, 33}}</ref>

One [[DRG Class 61|streamlined 4-6-4T]] was built for the [[Deutsche Reichsbahn]] in 1935.