NER Class P
{{Use dmy dates|date=August 2017}}
{{Use British English|date=August 2017}}
{{Infobox locomotive
| powertype = Steam
| name = NER Class P
LNER Class J24
| image = NER Class P No. 1823.jpg
| caption =
| designer = Wilson Worsdell
| builder = NER Gateshead Works (50)
NER Darlington Works (20)
| builddate = 1894-1898
| totalproduction = 70
| whytetype = 0-6-0
| gauge = {{track gauge|ussg}}
| driverdiameter = {{convert|4|ft|7.25|in|3|abbr=on}}
| length =
| locoweight = {{convert|38.5|LT|abbr=on}} (ns)
{{convert|39.55|LT|abbr=on}} (su)
| tenderweight = {{convert|36.95|LT|abbr=on}}
| fueltype = coal
| fuelcap =
| watercap =
| cylindercount = Two, inside
| cylindersize = {{convert|18|x|24|in|abbr=on}} (ns)
{{convert|18.5|x|24|in|abbr=on}} (su)
| firearea =
| boilerpressure = {{convert|160|psi|abbr=on}}
| tractiveeffort = {{convert|19140|lbf|abbr=on}} (18" cylinders)
{{convert|20220|lbf|abbr=on}} (18½" cylinders)
| operatorclass =
| withdrawndate = 1933-1951
| disposition = All scrapped
}}
The NER Class P (LNER Class J24) was a class of 0-6-0 steam locomotives of the North Eastern Railway.{{ cite book | author = Ian Allan | title = ABC of British Railways Locomotives | year = 1948 | volume = Part 4 | page = 41 }}{{ Cite encyclopedia | title = The W. Worsdell J24 (NER Class P) 0-6-0 Locomotives | url = http://www.lner.info/locos/J/j24.shtml | encyclopedia = LNER Encyclopedia }} They were designed by Wilson Worsdell for mineral traffic.
Modifications
As built the locomotives had slide valves, but 20 were fitted with piston valves and superheaters between 1914 and 1920. The cylinder bore was increased by half an inch at the same time.
In the infobox (right) 'ns' denotes non-superheated and 'su' denotes superheated. Some locomotives later had their superheaters removed but the piston valves were retained.
British Railways
Thirty-four locomotives survived into British Railways ownership in 1948 and numbered 65600-65644 (with gaps).
Withdrawal
Withdrawals started under LNER ownership in 1933. British Railways quickly withdrew the remainder and all were scrapped by the end of 1951.