West Junction
Western Thunderer
Hi everybody, I have been enjoying reading other members postings and felt it was time to dip my toes in the hopefully warm water. I model very slowly in S7 with a preference for the Great Western steam era but also find 7mm diesels pretty impressive.
I have been using David J. Smiths GWR Switch and Crossing Practice book to try and get correct timbering for a GWR 1:8 crossover (6'.6" interval between tracks) but have come up with a problem regarding the centre line spacing between the timbers at the end of the vee legs. In table 9 page 147 he states that the vee legs in 1:8 crossover roads is 12'.0" which therefore requires a timber spacing of 2'.1" for the rail joint fishplates to be close to the chairs (page 83 second column line 11). Unfortunately this lines up with the spacing between the BC and 4C chair timbers in the adjoining road which require a timber spacing of 2'.7" (table 3 page 141).
I find it hard to believe that David's book is incorrect with the vee leg length but also cannot see anything wrong with my conclusion regarding the timber spacing anomaly. Can anybody tell me if my conclusion is incorrect? If it is correct the only answer I can come up with is to increase the length of the vee wings so that the rail joint at the end of the vees lines up between the BC and 2C chairs in the adjoining road as shown for the 1:7 crossover on page 86 (Fig.44).
I have been using David J. Smiths GWR Switch and Crossing Practice book to try and get correct timbering for a GWR 1:8 crossover (6'.6" interval between tracks) but have come up with a problem regarding the centre line spacing between the timbers at the end of the vee legs. In table 9 page 147 he states that the vee legs in 1:8 crossover roads is 12'.0" which therefore requires a timber spacing of 2'.1" for the rail joint fishplates to be close to the chairs (page 83 second column line 11). Unfortunately this lines up with the spacing between the BC and 4C chair timbers in the adjoining road which require a timber spacing of 2'.7" (table 3 page 141).
I find it hard to believe that David's book is incorrect with the vee leg length but also cannot see anything wrong with my conclusion regarding the timber spacing anomaly. Can anybody tell me if my conclusion is incorrect? If it is correct the only answer I can come up with is to increase the length of the vee wings so that the rail joint at the end of the vees lines up between the BC and 2C chairs in the adjoining road as shown for the 1:7 crossover on page 86 (Fig.44).