| 1858 | Initial ideas and versions for the construction of the Mariazell Railway |
| 1896 | Start of construction of the Pielach Valley railway |
| 1898 | Opening of the Pielach Valley railway to Kirchberg/Pielach on 4th July 1898. Chief engineer: Josef Fogowitz of the Lower Austria state railway office |
| 1903 | Resolution of the Lower Austrian state parliament: Construction and continuation of the railway as far as Mariazell and Gußwerk. |
| 1905 | Opening of the section to Laubenbachmühle |
| 1906 | Construction of the Gösing tunnel (2,369 m) |
| 1907 | On 2nd May 1907, the full route to Mariazell was opened (to Gußwerk on 15th July 1907) |
| 1908 | Construction of the Mh.6 steam locomotive (still in service today) |
| 1910 | On 24th September, Emperor Franz Josef travels on the Mariazell Railway to Mariazell. The emperor's party stops in Laubenbachmühle. |
| 1911 | Electrification of the route under Eduard Engelmann. On 7th October, fully electrified services commence on the Mariazell Railway. This was a revolutionary development back then! A completely unique electricity supply system: 6,500 volts and 25 hertz. The first locomotives: the 1099 electric locomotives, which remained in regular service until 2013. |
| 2010 | Takeover of the Mariazell Railway by NÖVOG in December 2010 |
| 2011 | Presentation of the "Himmelstreppe" project in May 2011 |
| 2012 | Construction of the Laubenbachmühle operations centre began at the start of 2012 |
| 2013 | Work on the Laubenbachmühle operations centre was completed in July |
| 2013 | Der reguläre Fahrplanbetrieb erfolgt ab Oktober 2013 mit der Himmelstreppe |
| 2014 | The first-class panoramic carriage came into service in June 2014 |
| 2014 | Das Betriebszentrum Laubenbachmühle wird mit dem OIKOS, dem Niederösterreichischen Holzbaupreis, in der Kategorie Öffentliche- und Kommunalbauten ausgezeichnet |
| 2015 | The Mariazell Railway and the Laubenbachmühle operations centre formed part of the Lower Austrian regional exhibition "ÖTSCHER:REICH – The Alps and us" |
| 2017 | Anniversary – 110 years of the mountain section of the Mariazell Railway |
