Article 8 Gauge of railway and motive power
The railway shall be constructed and operated on a nominal gauge of 15 inches (381 millimetres) and the motive power shall be steam, diesel-electric, diesel, internal combustion, electric-battery or such other motive power as the Secretary of State may approve:
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Provided that nothing in this Order shall authorise the use of electrical power as motive power on the railway unless such power is obtained from storage batteries or from a source of generation entirely contained in and carried along with the engines and carriages:
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Provided also that, if electrical power is used as motive power on the railway, such electrical power shall not be used in such a manner as to cause or be likely to cause any interference with any telecommunications apparatus or with telecommunication by means of such apparatus.