If a rail vehicle containing explosives is held at a rail yard or siding—
(a) the maximum amount of explosive of any hazard division, except hazard division 1.4, per vehicle must not exceed 40 000kg; and
(b) the explosives must not be kept in the rail yard or siding for longer than—
(i) 48 hours over 2 consecutive business days; or
(ii) if there is a weekend or public holiday within 48 hours after the explosives are first kept in the rail yard or siding—4 days.