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Power is transmitted via a steel flywheel attached to the engine to a wheel with a friction lining on its surface which is able to slide along a splined shaft set at 90° to the crankshaft. Sliding the driven wheel towards the outer edge of the flywheel increases the gearing. Sliding it across to the opposite side of the flywheel reverses the drive.
<gallerymode=packed heights=200px style="text-align:left">File:Wickham 1.jpg | Detail of the Wickham transmission
File:Wickham 2.jpg | Detail of the Wickham transmission
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|9032||8200/1958||Type 27 Mk III || Ford 10hp || data-sort-value="1/7/1977" |Ex Longtown (Army) 1977||No||[https://www.flickr.com/photos/71592768@N08/7157311136 Flickr photo] ||Still present in 1998.
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The picture of Bridgnorth Yard including TP49P shown below is dated at 17 September 1968 (Picture by Ben Brooksbank via Wikimedia Commons). SVR Stock Books date the arrival of the first trollies including TP49P to 28 November 1968. It is unclear which of these dates is incorrect.
Threads discussing the identity and fate three Type 27A trolleys can be found [https://groups.io/g/WickhamofWare/topic/severn_valley_railway_type/25209296?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,25209296 here] and [https://groups.io/g/WickhamofWare/topic/severn_valley_railway_type/25618346?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,25618346 here].
==Gallery==
<gallerymode=packed heights=200px style="text-align:left">LNER_748_20150214.jpg | Type 17 No 748
Wickham_Trolley_3189_20160213.jpg |Ex-Type 17A No PWM 3189
Wickham_Trolley_8085_20150725.jpg | Type 27 Mk III No 9021
Wickham Trolley Bewdley 20180311.jpg|Ex-Type 17A No DB965054 (left)
Wickham_Trolley_7690_20150307.jpg |Type 17A TP49P
Bridgnorth Severn Valley Railway Locomotive Yard and Station geograph-2781621-by-Ben-Brooksbank.jpg | Bridgnorth Yard including TP49P in 1968 (Ben Brooksbank)
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