As walkers negotiate the long winding path from Llanberis to the summit of Snowdon on 6 August 2002, some less hardy people take the easy option, travelling to the summit on the Snowdon Mountain Railway's diesel electric railcars 23 & 21. The railway acquired three of these railcars in 1995 from HPE Tredegar Ltd, but control problems led to them being withdrawn by 2003, and ultimately scrapped. Because each railcar only had one set of pinions, they could not work singly. Incidentally, Wikipedia states that No.21 had been withdrawn by 2001. This is clearly wrong, as No.21 is definitely the rear vehicle of this pair.