GCR Class 1A

{{Use dmy dates|date=January 2017}}

{{Use British English|date=January 2017}}

{{one source|date=October 2016}}

{{Infobox Locomotive

|powertype = Steam

|name = GCR Class 1A
LNER Class B8

|image = Retford (GC) Locomotive Depot geograph-2844891-by-Ben-Brooksbank.jpg

|caption = No. 1349 at Retford (GC) Locomotive Depot 13 April 1947

|designer = John G. Robinson

|builder = Gorton Works

|serialnumber =

|builddate = 1913–1915

|totalproduction = 11

|whytetype = 4-6-0

|uicclass = 2'Ch2

|gauge = {{track gauge|ussg}}

|leadingdiameter = {{convert|3|ft|6|in|m|3|abbr=on}}

|driverdiameter = {{convert|5|ft|7|in|m|3|abbr=on}}

|length = {{convert|63|ft|0.3|in|m|3|abbr=on}}

|locoweight = {{convert|122|LT}}

|fueltype = Coal

|fuelcap = {{convert|6|LT}}

|watercap = {{convert|4000|impgal}}

|cylindercount = Two, inside

|cylindersize = {{convert|21.5|x|26|in|mm|0|abbr=on}}

|firearea ={{convert|26|sqft|abbr=on}}{{sfn|Boddy|Brown|Fry|Hennigan|1975|p=43}}

|totalsurface ={{convert|2183|sqft|abbr=on}}{{sfn|Boddy|Brown|Fry|Hennigan|1975|p=43}}

|superheaterarea ={{convert|294|sqft|abbr=on}}{{sfn|Boddy|Brown|Fry|Hennigan|1975|p=43}}

|boilerpressure = {{convert|180|psi|MPa|2|abbr=on}}

|diameterinside = {{convert|5|ft|6|in|mm|abbr=on}}

|tractiveeffort = {{convert|27445|lbf|kN|1|abbr=on}}

|operator = {{ubl|Great Central Railway|→ London and North Eastern Railway|→ British Railways}}

|operatorclass =

|powerclass =

|axleloadclass =

|withdrawndate = 1947–1949

|disposition = All scrapped

}}

The Great Central Railway Class 1A, classified B8 by the LNER, was a class of 4-6-0 mixed-traffic locomotives designed by John G. Robinson for fast goods, relief passenger and excursion services. They were known as the ‘Glenalmond Class’ and were a smaller wheeled version of Robinson's earlier Sir Sam Fay express passenger class (LNER Class B2), which they closely resembled.