User talk:SteF81

Votre opinion SVP
Bonjour stephane, je désire avoir vôtre opinion sur le suivant.

The Réseau électrique métropolitain wants to replace the 25 kV AC 60 Hz on the Deux-Montagnes line of the Agence métropolitaine de transport through the Mount Royal Tunnel with 1800 V DC. The Réseau claims that 25 kV AC is unsuitable for light rail and that a 25 kV AC to 1800 V DC transformer is “too heavy” thus increasing the axle load too much C'est vrai ça?.

The following is "copy and paste" from two e-mails:

1) Hello M. Horn, Thank you for your interest in the REM project. The REM is an integrated network running from the South Shore to Deux-Montagnes and Sainte-Anne-de-Bellevue. Several criteria must be respected, including that of axle load, which must be compatible with the new Champlain Bridge. This load is maximum 14.8 tonnes/axle, which does not allow 25 kV of rolling stock to be used of which the on-board equipment is often much heavier (more than 18 tonnes / axle). C'est vrai ça? Furthermore, there is, on the market, no combined equipment 25 kV / 1500 DC available and entirely automated to meet the high frequencies that are expected with the REM. C'est vrai ça? Finally, the expected frequencies in the Mont-Royal tunnel will be high: at least one train every 3 minutes at peak times and every 6 minutes at off-peak times, which doesn’t leave the train path available for other services. If you have any further questions, do not hesitate to contact us. Best regards,

2) Hello Mr Horn, Thank you for your continued interest in the REM project. The choice of 1500 Vdc automated rolling stock derives from several factors: All these factors being considered lead to our choice of 1500 Vdc power supply for the REM project in order to ensure that the train that will be proposed is of a standard model with high reliability and performance. Best regards,
 * the trains configuration suiting the planned ridership and dwelling times requires multiple wide doors per car, which calls for “metro” type trains
 * service proven automated operation is mostly deployed on “metro” type trains
 * the axle load limitation of 14,8 t/axle [sic, 14.8 t] is to be considered for a maximum passengers density of 8 p/sq.m, [sic 8p/m2] leading to a more stringent empty car axle load limitation less achievable if a 25 kVac transformer is to be installed.
 * most “metro” type trains are offered with DC power supply (1500 Vdc or 750 Vdc)
 * the need to align our specifications to the widest pool of train manufacturers as well as the most standard and service proven products


 * This scheme is opposed by both the Agence métropolitaine de transport and Via Rail and the real corker is that because it shares the south entrance of Central Station with Via Rail and Amtrak trains the 'light rail' vehicles must conform to the Canadian equivalent of US FRA rules and thus become heavy rail vehicles. I believe the public relations representative of the REM is talking nonsense. I believe that any reputable rolling stock manufacturers can build anything according to any given specifications. My email address is peter.j.c.horn@gmail.com Peter Horn User talk 16:41, 6 October 2016 (UTC)

"J'attend toujours votre opinion. Peter Horn User talk 21:33, 21 October 2016 (UTC)
 * Bonjour Stéphane,

Je voudrais savoir la vraie pesanteur des équipements nécessaires pour réduire 25 kV 60 Hz à 480 V AC et 1800 V DC. Autrement dit, quelle est la vraie pesanteur des équipements nécessaires pour faire qu'un train roule à la fois sous 25 kV 60 Hz ou sous 1800 V DC. Je pense que ça ne prend pas un transformateur dites 'lourd', et que les "18 tonnes par axle" est un mensonge. mon courriel est peter.j.c.horn@gmail.com Peter Horn User talk 02:20, 21 November 2016 (UTC)
 * C'est plutôt 1500 V DC. Peter Horn User talk 02:24, 21 November 2016 (UTC)
 * Axle load = charge à l'essieu. Peter Horn User talk 02:50, 21 November 2016 (UTC)

Railway electrification system of Rubber tyred systems
Stephane, Please review this description of rubber tyred systems Peter Horn User talk 19:08, 5 December 2016 (UTC)