page_title: Buchli drive
section_title: Other designs
hierarchical_section_title: Buchli drive / Other designs
caption_attribution_description: English: Two Ae 4/7 running in multiple on a trial run to get the admission to run on the Swiss rail network again. A former MThB Re 4/4 I is pulled along. The two Ae 4/7 are going to be used by Rail4Chem. Deutsch: Zwei Ae 4/7 in Vielfachsteuerung auf einer Testfahrt für die erneute Zulassung. Eine Ex-MThB Re 4/4 I wird mitgeführt. Die beiden Ae 4/7 werden für Rail4Chem zum Einsatz kommen.
context_page_description: The Buchli drive is a transmission system used in electric locomotives. It was named after its inventor, Swiss engineer Jakob Buchli. The drive is a fully spring-loaded drive, in which each floating axle has an individual motor, that is placed in the spring mounted locomotive frame. The weight of the driving motors is completely disconnected from the driving wheels, which are exposed to movement of the rails.
  First used in electric locomotives from the 1920s, the Buchli drive made possible the construction of faster and more powerful locomotives that required larger and heavier traction motors. The system minimises the impact on rail tracks due to the reduction in the overall unsprung weight. Although the drive was very successful though the 1930s, it is little used in modern locomotives, having been replaced with smaller, simpler drives that exhibit less imbalance and allow higher speeds.
context_section_description: In addition to the standard implementation, there were also the following variations:
caption: Two Ae 4/7 on a trial run in 2007. Note the difference in appearance; both sides can be seen
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