Potential route under the bypass
I don't know what rules there are about routes like this. The headroom is about 6'6" (currently a bit less at the downstream end due to silt).
Elsewhere it's been suggested that a much smaller culvert is 'ok'. Of course Network Rail is notoriously 'difficult', but this sets a precedent (the Ramblers are disagreeing with NR but I suspect they might be happier with this one if access was improved.) -
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At Ben Lui, where BTP officers have been monitoring the main western ascent/descent route from Glen Lochy we've indicated that we see no problem in crossing the line by this route and consider that the alternative suggested – using a low culvert and wading through the burn which feeds into the main river – is dangerous due to slippery surfaces in the culvert as well as deep water pools. The BTP officers who were on site appeared to accept these difficulties and did not disagree that a better approach would be to continue walking across the railway line but with NR signage in place to warn of the risk from approaching trains.
We were told by the BTP officer who had tried the culvert route that he had had to remove his rucksack and throw it across the railway line before squeezing through the culvert. In addition to these problems there is also the expectation that anyone using the culvert route is likely to have their boots fill with water, which is not the way that most hillwalkers would expect to start an ascent of Ben Lui in winter.
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http://www.ramblers.org.uk/policy/scotland/crossing-railway-lines-in-scotland/background-to-crossing-railway-lines.aspx