There are services provided by other train companies to Croatia, Hungary, Poland, Czech Republic, Slovakia and Slovenia that operate under the Nightjet Partner label.

During December 2015, the German state railway company Deutsche Bahn announced that it would stop its night train services under the City Night Line branding and replace them with additional overnight high speed ICE services; this outcome followed years of efforts to turnaround the sector, which the company claimed to be little used, accounting for roughly 1% of all long-distance passengers that year, and thus unprofitable.

[9] Usage of the service steadily grew during the 2010s; in October 2019, ÖBB CEO Andreas Matthä stated the passenger traffic on the Nightjet had grown by 10 percent over the year prior.

[11] In December 2020, four railway companies, including ÖBB, Deutsche Bahn, SBB, and France's SNCF, signed an agreement to cooperate on the development of night train services across Europe; specifically, the launch of four new Nightjet connections between 13 European cities will be prioritised.

[14][15][16] In October 2019, as a stopgap measure, ÖBB announced its intention to lease sleeping and couchette cars, permitting additional Nightjet services to be operated without having to wait for the delivery of its outstanding Siemens order.

When combined with previous orders, ÖBB's new-build rolling stock for the Nightjet includes 231 new sleeping cars, couchettes, and seated vehicles; the expansion of the fleet will enable the operator to reach more destinations.

[18][19] That same month, as to accommodate the expanding fleet, ÖBB invested €40m into the modernisation and enlargement of the Vienna Simmering depot, which included the construction of a new 5,500m2 maintenance hall with two elevated tracks.