[2] The main line was surveyed with at maximum grade of 33 ‰ (1 in 29.5) and deep cuts and high trestle bridges much more elaborately than similar tramways.

The Percy Burn Viaduct is 125 m long and 36 m high, and was specified for the transport of the 80 t Lidgerwood steam winch, which had been imported from the United States as well as the heavy load of logging trains.

The teacher of the camp's school, who was employed by the sawmilling company helped him in the afternoon after finishing his classes by cutting the thread onto the bolts.

The larger Percy Burn Viaduct was completed around 1925, and shortly after its erector, the Chester Construction Company went bankrupt because of the overspend.

The American steam winch was overdimensioned for the NZ bus and shipping was more costly than expected because the new built harbour quickly silted, after the expensive breakwater had been completed, which made loading of ocean going vessels more complicated than originally envisaged.

The oversaturated timber markets resulted in unattractive pricing, so that the company became unprofitable, and the investors could not be satisfied.

Shortly after, Sims Cooper, one of the original investors, founded a new company, Holdings Limited, to takeover the liquidated assets of MTC.

Holdings Limited employed several caretakers, to protect the assets at this remote location, and took-over the log harvesting and tramway licences formerly held by Marlborough Timber Company, in the hope of revamping business and getting a return on their investments.

In previous months, the MTC had obtained a new licence for harvesting the governmental forests north of the Maori land around Percy Burn Viaduct, as it became evident, that they couldn't get funding for a new bridge over the Wairaurāhiri River, which would have been the only alternative, to obtain access to undepleted forest areas.

In 1930 they briefly re-commissioned the sawmill, but the sinking timber prices due to the worldwide depression in the 1930s upset their plans.