The Volvo B7TL chassis is a 2-axle low floor double decker chassis fitted with a transversely mounted Volvo D7C and a Voith ZF gear box.
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Here on Street View in March 2019 No. 4637 is seen on Yardley Wood Road close to its junction with Brook Lane, wearing the red and gold livery of NX WM. Its rear destination blind shows that it is operating route 11A (The Outer Circle – Anticlockwise). Route 11 was formerly Europe’s longest urban bus route at 27 miles (43 Km).