Summary edit

1) In this old tram from the 1970's the passengers have to climb stairs, which causes a risk of falling. Several handgrips are added to decrease the risk.

2) The edges of the door contain a pressure detector opening the doors whenever there is obstacle (like hand etc) between the doors. The detector is used to avoid entrapment accidents. The doors operate automatically, and the driver is informed whenever any of the doors is open. The tram won't leave the stop before all the doors are safely closed.

3) Other kind of detectors like light cells can be used to give information whether there are obstacles like passengers between the doors or whether the doors can be shut. Detectors may give also information whether the doors are open or safely closed.

In addition, the door can be used as an emergency exit - when the tram is stopped, the doors can be unlocked with an emergency switch. The driver can typically see at least some of the doors via mirrors, or in rare cases on a camera monitoring system.

Licensing edit

I, Pöllö, the copyright holder of this work, hereby publishes it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	Attribution: I, Pöllö
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

This file is licensed under the Creative Commons Attribution 2.5 Generic license.

Attribution: I, Pöllö

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

https://creativecommons.org/licenses/by/2.5CC BY 2.5 Creative Commons Attribution 2.5 truetrue

You may select the license of your choice.