B 20-33.8 | TrainsDepot.org

Between 1957 and 1963, 35x units from this series are acquired as follows:
- units B 831 - 860 acquired by Bern-Lötschberg-Simplon Bahn;
- units B 601 - 603 acquired by Spiez-Erlenbach-Zweisimmen Bahn;
- units B 621 - 622 acquired by Gürbetal–Bern–Schwarzenburg Bahn.

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

1965

9x additional units are delivered, registered B 861 - 869.

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

1969

The units delivered between 1957 and 1963 are upgraded with new bogies, improved ventilation and rubber gangway diaphragm at both ends.

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

1976

7x additional units registered B 20-33 839 - 845 are delivered in 1976.

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

1986

Units B 20-33 881 & 829 are converted to As 20-33 826 - 827 "Salon Bleu".

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

1987

Units B 20-33 871 & 827 are converted to B 89-33 828 - 829.

Sources: https://www.bahnforum.ch/index.php?thread/13961-ew-i/&postID=869631#post869631

1988

Between 1988 and 1989, units B 20-33 839 - 845 receive a luggage compartment and are registered as BD 82-33 839 - 845.

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

1990

Unit B 20-33 837 is converted to B 89-33 837 "Salon Bleu" as an experimental unit with air conditioning.

Sources: https://www.drehscheibe-online.de/foren/read.php?017,8429173

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