GNR Class N1

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

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

{{Infobox locomotive

|powertype = Steam

|name = GNR Class N1
LNER Class N1{{sfn|Boddy|Brown|Fry|Hennigan|1977|pp=45, 55–56}}

|image = Bradford Hammerton Street Locomotive Depot geograph-2370243-by-Ben-Brooksbank.jpg

|caption = Nos. 9459 and 9479 at Bradford Hammerton Street Depot in 1947

|designer = Henry Ivatt

|builder = Doncaster Works

|serialnumber =

|builddate = 1906–1912

|totalproduction = 56

|whytetype = 0-6-2T

|uicclass = C1 n2t, eleven later C1 h2t

|gauge = {{RailGauge|ussg}}

|driverdiameter = {{convert|5|ft|8|in|m|3|abbr=on}}

|trailingdiameter = {{convert|3|ft|8|in|m|3|abbr=on}}

|length = {{unbulleted list|First: {{convert|35|ft|7+1/2|in|m|2|abbr=on}}|Remainder: {{convert|36|ft|7+1/2|in|m|2|abbr=on}}}}

|wheelbase = {{unbulleted list|First: {{convert|23|ft|3|in|m|2|abbr=on}}|Remainder: {{convert|23|ft|9|in|m|2|abbr=on}}}}

|axleload = {{convert|18.00|LT|abbr=on}}

|weightondrivers = {{unbulleted list|First: {{convert|51.20|LT|abbr=on}}|Remainder: {{convert|51.35|LT|abbr=on}}}}

|locoweight = {{unbulleted list|First: {{convert|64.70|LT|abbr=on}}|Remainder: {{convert|65.85|LT|abbr=on}}}}

|fueltype = Coal

|fuelcap = {{convert|4.00|LT}}

|watercap = {{convert|1600|impgal|abbr=on}}

|boiler = LNER diagram 7

|boilerpressure = {{convert|170|psi|MPa|abbr=on}}

|firearea = {{convert|19|sqft|m2|abbr=on}}

|cylindercount = Two, inside

|cylindersize = {{convert|18|x|26|in|mm|0|abbr=on}}

|valvegear = Stephenson

|valvetype = Slide valves

|tractiveeffort = {{convert|17900|lbf|kN|2|abbr=on}}

|operator = {{unbulleted list|Great Northern Railway|London and North Eastern Railway|British Railways}}

|operatorclass = GNR/LNER: N1

|fleetnumbers = {{unbulleted list|GNR: 190, 1551–1605|LNER: 3190, 4551–4605; 9430–9485|BR: 69430–69485}}

|axleloadclass = LNER/BR: Route availability 5

|powerclass = {{unbulleted list|LNER: 2|BR: 2MT}}

|withdrawndate = 1947–1959

|disposition = All scrapped

}}

The Great Northern Railway (GNR) Class N1 was an 0-6-2T side tank steam locomotive designed by Henry Ivatt and introduced in 1906. They were all withdrawn from service between 1947 and 1959. None have survived.

File:Harringay with ex-GN Ivatt 0-6-2T geograph-2882454-by-Ben-Brooksbank.jpg

Most of the class were fitted with condensing apparatus and worked in the London area, from King's Cross and Hornsey depots, on empty coach trains, and on cross-London exchange freight trains.

In 1914, Crewe Works built an armoured train which used a Class N1 engine. The engine was covered by a 14mm steel plate, and featured observation apertures to the front and side, closed by sliding steel shutters.{{cite book |last1=Osborne |first1=Mike |title=If the Kaiser Comes - Defence Against A German Invasion of Britain in the First World War |date=2017 |publisher=Fonthill Media Limited |location=England |isbn=9781781555750 |pages=90}} Two of the Ivatt tank engines No. 1587 and No. 1590 were loaned to Crewe to be fitted with armor plating and were named HMT Norna and HMT Alice respectively. They were sold back to the LNER in 1923 and had their armor plating removed.{{cite book |last1=Talbot |first1=Edward |title=A Pictorial Tribute to Crewe Works in the Age of Steam |date=1987 |publisher=Hayes/Oxford Publishing |pages=93–94 |url=https://www.steamindex.com/locotype/warloco.htm |access-date=27 September 2020}}