1900 1920s where?
On an unidentified shed, is it Crewe?
Starting life as a Webb 4 cylinder compound (Jan 1902) 1900 was rebuilt in 1906 into a class G 2 cylinder simple with larger boiler but retaining original inside cylinders. Note that these conversions by George Whale of the 4 cylinder compounds retained the 'piano front' covers of the inside cylinders, as shown, thus betraying its compound origin. Still in LNWR livery with full lining and paired with Webb 2500 gal tender so could have been taken pre WW1