In 1964 BR's Swindon workshops commenced manufacture of what is generally regarded as the biggest "white elephant" of the dieselisation programme, the D9500 0-6-0DHs, later allocated TOPS code 14.
Envisaged as the replacement for the GW pannier tank, there were criticisms early on that the locos had poor braking, and instances of runaways on coal traffic in the Welsh valleys when replacing steam. This may be in part due to the fact that unlike the steam loco, there was no "engine braking" to be had through the Voith transmission. Certainly the Paxman engines experienced problems, reputedly because BR had specified aluminium cylinder heads against Paxman's recommendations.
Although some locos were transferred to the Hull area, the short fact is that they were built as a shunter/tripper at a time when such duties were fast disappearing post-Beeching and it is scarcely surprising that their lives were short in BR service, all being officially withdrawn by the middle of 1969. D9555 was the last loco built at Swindon for British Railways (a batch of locos were later built there to Hunslet design for Kenya through BRE-Metro) but of the 56 Class 14s built, most passed direct to industrial users. Reputedly costing £14000 each to build, BR offered them at £3000 each with "one careful owner, low mileage" and they were snapped up, mostly by BSC and the NCB. 19 currently survive in preservation, where their horsepower, weight and speed make them ideal on heritage railways either as standby locos or as principal locomotive for lighter traffic days.
The nick-name Teddy Bears for these locos has two reported origins - one that it is from the "face" created by the cab/casings, the other quoting a Swindon foreman saying, perhaps ruefully, "We've built the 'Great Bear', now we're going to build a 'Teddy Bear'".