In the following years, numerous other leasing arrangements and strategic partnerships have come about between Rock Rail and other organisations, including South Western Railway, Avanti West Coast, and East Midlands Railway; the company has come to comprise roughly 40 percent of all new rolling stock orders in the UK rail market at times.

[1] It has been described as an investor and asset manager of passenger-orientated rolling stock and other rail-side infrastructure, such as electrification, digital signalling and depots, and introducing new technologies to the sector.

[2] During February 2016, the company announced its first rolling stock leasing deal, valued at £200 million, for 25 Siemens Mobility-built Class 717 dual-voltage electric multiple units (EMUs) on behalf of Govia Thameslink Railway.

[3] On 4 October 2016, Rock Rail also financed the purchase of 20 Stadler-built Class 745 and 38 Class 755 multiple units for Abellio Greater Anglia; the deal, at a cost reportedly in excess of £600 million, was described by Abellio UK Managing Director Dominic Booth as one part of "the largest-ever privately-funded train procurement in the UK".

Management has reportedly viewed the general state of Britain's rolling stock as 'elderly' and prime opportunities for being involved in its replacement.