A releaseable rail coupling 1000 for releaseably coupling a first rail 10A to a second rail 10B; the first rail providing a first portion P1 of a running surface RS, the rail coupling comprises a first part 1100 having a first end 1110 comprising a first male coupling member 1111 and a second end 1120 arranged for joining to the first rail 10A. The rail coupling 1000 comprises a second part 1200 having a first end 1210 comprising a corresponding first female coupling member 1212, arranged to receive the first male coupling member 1111 therein, and a second end 1220 arranged for joining to the second rail 10B. The rail coupling 1000 is arrangeable in a first configuration wherein the first male coupling member 1111 and the first female coupling member 1212 are uncoupled. The rail coupling 1000 is arrangeable in a second configuration wherein the first male coupling member 1111 and the first female coupling member 1212 are coupled by receiving the first male coupling member 1111 in the first female coupling member 1212. The rail coupling 1000 provides a third portion P3 of the running surface RS in the second configuration.
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