Recently re fitted 26035 . Fitted with zimo multi drive . 2 x 8 ohm speakers wired in parallel . 1 on top of bogie tower and one 23mm trax mega bass speaker fitted with DIY plasticard enclosure between drilled out water tank. It 'just' fits . Wires routed via hole drilled in sole bar. Also added a you choose super cap , well worth it over the standard stay alive and nearly as good as the ESU for half the cost !