Class G15 Wisbech and Upwell Steam Trams

The classic Wisbech and Upwell tram engine, which later gained worldwide fame as 'Toby' in Reverend Awdry's Railway Stories, was class G15, ten of which were built between 1883 and 1897. Designed by the GER's Locomotive Superintendent T W Worsdell they resembled a goods brake van, fitted with skirts and cowcatchers, condensing apparatus, spark arrestors, automatic governors and warning bells, to make them safe on the line's mainly roadside track. They were also fitted with controls at both ends and sliding windows all round. 

The locos were rebuilt in the early 20th century, where they were fitted with the 140 psi boilers that were used on the later J70 locos, The last G15/Y6 was withdrawn in 1952 and survived in the Stratford paint shop for another year, before being scrapped.

Picture source