I understand a lot of the quirks of British railroading in the steam era. Tiny loading gauge means inside and angled cylinders are common, cars were lighter, steam lasted much longer and got more technologically advanced than most US railroads. But I've never understood this:

In the US, locomotives with no pilot axle were universally regarded as unsuitable for anything except yardwork. They had problems with tracking - they would violently toss back and forth when moving at speed. As such, 0-6-0s, 0-8-0s, and the much less common 0-4-0s and 0-10-0s were made with tiny drivers, and were only used for mainline (or even branchline) freight when nothing else could be used. Even helper engines weren't 0-6-0s, helper engines were generally 4-6-0s, 2-6-0s, 2-8-0s and 2-8-2s.

In British railroading, this was not at all the case. High-drivered(relative to American and Canadian switching engines), mainline or branchline 0-6-0s were massively popular up until the end. One of the most technologically advanced British locomotives was the SR Q1 class, an 0-6-0 made for heavy mainline freight. Locomotives with no pilot axle even made their way into passenger service.

Why didn't the British 0-6-0s have the tracking issues of American 0-6-0s? The thought of an 0-6-0 running a passenger train at 40 MPH is absolutely unthinkable in North America, but a regular occurrence until the end of steam in British Railways. Why did the 2-6-0 not show an obvious technical advantage over the 0-6-0 in the UK like it did in the US and Canada?