0gradientes modelo ferroviário

ferrovias modelo, como a coisa real, tendem a ser bastante plana.  Se você quiser ot têm layouts mais complexos com gradientes que você precisa planejar cuidadosamente com antecedência, e evitar a tentação de criar um irrealista (e undriveable!) inclinar.

Many mod­el­lers wish to build mod­els that look real­ist­ic, so let’s start with what sort of gradi­ents are found on the real rail­ways.  The Wors­brough incline on the former wood­head main­line from Manchester to Shef­field was a 1 em 37 inclinar, and reg­u­larly used 4 motores.  Parts of Mer­sey rail are claimed to be as steep as 1 in 27 as is the Middleton Junc­tion to Old­ham Wer­neth line.  More sus­tained gradi­ents include examples such as around Ports­mouth where the line from Goldalm­ing to Haslemere has a gradi­ents of around 1 em 80.  The Lickey incline near Birm­ing­ham is a 1 em 38 incline para 2 milhas.

Put anoth­er way, short inclines on the real rail­ways have been as severe as 1 em 27 (3.7%), but these required spe­cial bank­ing locos or mul­tiple locos.  The steep­est sus­tained inclines that are oper­ated without spe­cial locos don’t exceed 1 em 80 (1.25%)

Para atravessar trilhas com 00 bitola exige uma altura de 60 milímetros da parte superior da trilha, to bot­tom of base­board above.  With a baseboard+track thick­ness of 10mm this means to cross one track over anoth­er will require a rel­at­ive height dif­fer­ence of at least 70mm.  Achiev­ing this in the shortest dis­tance can be achieved by 1 track sink­ing 35mm and the oth­er rising by 35mm.

With a real­ist­ic incline of 1.25% este requer um comprimento de 2,8 m!

Unless you have a lot of space it will be hard to build a lay­out with a cross over that sticks to real­ist­ic real world inclines.  So the next ques­tion is — what is the steep­est incline that can be oper­ated suc­cess­fully with typ­ic­al 00 locos calibre, and is there any­thing that can be done to improve this.

Os usuários na hornby for­um sug­gest that around 1 em 75 seems to be the lim­it for a 6-coach train. Anoth­er recom­mend­a­tion está ao redor 1 em 60. Isto pode ser empurrado para 1 em 50 with short­er trains, mas com o comprimento completo (8−10 car­riage) trains pulled by steam locos any­thing steep­er than 1 em 50 é pouco provável que funcione. Using the same for­mula as above the length required it still 1.75m. Anoth­er good sum­mary is Mod­elRail­way­En­gin­eer.

podemos melhorar esta

One way mod­el­lers have improved loco grip in the past has been to increase loco weight. This has the obvi­ous down­side of increas­ing the weight that the motor has to pull up any incline, and there is often lim­ited space inside locos to fit weights. I recently wondered if it would be pos­sible to improve the grip of locos by pla­cing a mag­net­ic mater­i­al under the track and using super-strong mod­ern mag­nets (cheaply avail­able from ebay) em locos para melhorar a aderência. Well — it turns out it is — and there is already spe­cially designed kit called Powerbase being sold for exactly this pur­pose. DCC con­cepts guar­an­tee that Powerbase will double the pulling power of locos up 1 em 30 gradi­ents, but what will your locos pull up those gradi­ents to start with, e quanto vai PowerBase ajuda com um 1 em 50 inclinar?

um teste of powerbase found a 2−6−0 loco on a 1 em 35 gradi­ent improved from pulling 8 wag­ons to pulling 29 wag­ons and could have done more.

Anoth­er example of the improve­ments avail­able was recently in the Hornby magas­ine. Com um 1.5% inclinar (1 em 66) quase todos os loco tested duplicou o que poderia puxar, with smal­ler 0−6−0 and 4−4−0 locos able to pull 6 ou 7 car­riages, and lar­ger 2−6−0 and 4−6−0 locos able to pull 12+ car­riages.

Usando Powerbase parece que se inclina de 1 em 30 are pos­sible with good length trains, tak­ing the length required for such an incline to only 1m.

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