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In special circumstances, such as inside tunnels, the ballast is sometimes replaced with a concrete slab.
In special circumstances, such as inside tunnels, the ballast is sometimes replaced with a concrete slab.
This takes less room (hence its advantage in tunnels), but must be laid very precisely as there is no "give" as there is with conventional ballast.
This takes less room (hence its advantage in tunnels), but must be laid very precisely as there is no "give" as there is with conventional ballast.
== Fastenings ==
== Fastenings ==