Rails placed using the setblock command will only be oriented by the specified dataValue if there is already a rail at the specified coordinates. Otherwise, it will orient the rail such that it connects to adjacent rails, or if there are none, it will always place the north_south variant.
To reproduce, use this command in an open space:
/setblock ~1 ~ ~ minecraft:rail 9 replaceThis will place a straight section of rail north/south. Without moving, use the command again, and the rail will change into the desired type: a curved section facing north/east.
If positioned so that the rail will be placed next to another rail, both rails will change shape in order to connect.
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marcono1234
Confirmed for
1.8.2-pre1 Note that this works if at the spot where you want to place a rail is already a rail (workaround)
Please reopen because of Searge's Comment
Torabi
Testing in 1.8.2-pre6, replacing an existing rail with setblock will respect the provided dataValue. However, if there isn't already a rail in the specified block, it will always place the north_south (0) shape.
marcono1234
Confirmed for
15w37a
Confirmed for 15w43c.
Confirmed for 15w44a.
Erik Broes
Sorry, but that would, as far as I know, be a feature request, not a bug...