Due to the steep inclines in the Razorback Ranges, the line included a section of rack railway between Moonmera and the Mount Morgan township.

The time for the rack loco to attach and detach added 40 minutes or more to the journey compared to a conventional line, and the maximum load was limited to ~130 long tons (130 t).

The engine shed moved to a new site to allow more room, and a turning triangle or forkline as installed to replace the turntable.

[3] By 1940, the complex consisted of station building, refreshment rooms, dock road, 20,000 imperial gallons (91,000 L; 24,000 US gal) tank, engine shed, oil store, examiners shed, 40 long tons (41 t) double rail weighbridge, goods shed, office and 10 long tons (10 t) crane with warehouse crane, station masters house, fireman's house, quarters, forkline, small coal stage and trucking yards.

The rack railway was closed in April 1952, after the Razorback Range deviation was opened, with grades of 1 in 50 (2%), able to handle ~750 long tons (760 t) trains, allowing the haulage of Callide coal through Mount Morgan with conventional steam locomotives.

A concrete retaining wall from the rack line remains at the top of the Razorback Ranges on the entry to Mount Morgan.

[3] During the 1960s, coal-fired steam engines were gradually replaced by diesel-electric locomotives which were maintained at the Rockhampton railway workshops.

The old line was dismantled in 1989, but the Mount Morgan station building and yard, and a short section of track, were retained for tourism purposes.

[3] The Station Building is a Classical Revival Boom Style structure with imposing roadside elevational treatment and 10 bay carriage shade.

Flanking verandahs strengthen the buildings symmetry which is offset by the 1912 additions, having their own portico in the manner of an end pavilion with pedimented treatment enhancing the overall composition.

Accommodation consists of the vestibule which is enriched on the platform side with fretted timber brackets and spandrels, comparable with Clifton and Toowoomba station buildings.

The carriage shade protects 2 tracks and has standard curved Warren girder trusses supported on timber posts and c.g.i.

[3] Mount Morgan Railway Station Complex was listed on the Queensland Heritage Register on 21 October 1992 having satisfied the following criteria.

Mount Morgan railway station has historic significance as a substantial and imposing complex built to serve a thriving mining township.

Of the various comparable places including Charters Towers, Ravenswood and Gympie only Mount Morgan survives with a high level of integrity sufficient to directly demonstrate the optimism of the period.

The water tank is rare, comparing only with Quilpie in that its builder's plate connects it with the noted engineering firm of Walkers Limited of Maryborough.