The first part of the route for this section commenced in the vicinity of the present Ipswich railway station, it crossed the Bremer River at the town reach and followed the north bank from the North Ipswich Railway Workshops, across Mihi Creek and Iron Pot Creek, joining the route of the present main line at Wulkuraka.

This design comprised a floor and sides of cut sandstone with an arched roof made from a double layer of bricks.

A portion of the old line between North Ipswich and Wulkuraka was retained to serve the Railway Workshops and a small coal mine.

It is contained within a large undeveloped parcel of urban land that slopes down to the edge of the Bremer River.

[1] The culvert comprises a long tunnel, about 1.2 metres (3 ft 11 in) wide, beneath an unsealed roadway.

[1] Sandstone Railway Culvert was listed on the Queensland Heritage Register on 13 November 2008 having satisfied the following criteria.

This section of main line, running between the Bremer River at Ipswich and Bigge's Camp (now Grandchester), marked the beginning of Queensland's rail network and was an important step in the economic and social development of the State.

[1] As an element of the now bypassed section of main line between the original terminus at the Bremer River and Wulkuraka, the culvert provides tangible evidence of the economic and geographic priorities of the colonial government in the 1860s.

The government decided to terminate the first main line at the Ipswich reach of the Bremer River because it functioned as an inland port for the pastoralists of West Moreton and the Darling Downs.

The North Ipswich culvert is rare as one of the few surviving original components of Queensland's first section of main line railway.

The culvert follows the design approved by the Engineer in Chief for construction of the line, Abraham Fitzgibbon, in 1863 and comprises floors and sides of sandstone with an arched roof of bricks.