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Loco yards are different from almost all other yards... generically black.. but study pictires for your location/road and era. A new yard or a yard with recent maintenance will look difernt from an old yard. Locos shouldn't leak whether steammor diesel. Lubricants don't help bearings if they've spilled on the track and create slip hazards. Fuel is supposed to drive the train not decorate the track. One thing that would colour an area in steam days is ash... different coals produce different ashes. Despite all that whole yards or areas within them will accumulate mess over time. Modern facilities are extremely careful about mess because of the environment and to reduce hazards to staff. You can't get a shining loco out of a muck swamp. Other yards... a lot of the same applies... the big difference would be where a yard handled large amounts of anything producing spillage... especially dust. Grain produces dust, so does sand, coal, fertiliser. colours can vary from black to white. the product is supposed to travel not stay behind though... it often gets weighed at both ends... so losses have to be accounted for. A yard doesn't want to be buried... it impairs working. it would be cleaned up periodically. Spillage, especially of powders, can block drainage... causing puddles and problems (look at where puddles occur in photos of yards... and damage from wheels (of trucks) in bad surfaces... also tyre trails from puddles. Both yards... When drainage gets bad/blocked ties rot easily and the track can set solid or pump up and down - check videos. Spikes can break out, get sheered off or get yanked loose. This can allow the road to spread. SO maintenance is usually kep up... at least as traffic pays for. One thing no-one wants is a car or loco in the dirt... it's dangerous, time consuming and potentially damaging to both the car and load (or loco). So both balast and ties get regular maintenance in a yard... often between work on the main tracks. Frequently it will be piecemeal... partly (in a busy yard) to fit between cars/trains. usually odd ties will be swapped, ballast loosened, cleaned by hand, packed up and occasionally replaced. Rail bars will be kept tight and replaced if cracked... damaged ones will not (usually) be left about for people to fall over. Remember... people walk about in yards and vehicles move around in ways that do not happen out along the main track... so a yard should be cleaner under foot. Very occasionally a whole track or just a panel or two may be repaired and even completely replaced. Big thing to remember is that this MUST fit between traffic... a holiday shutdown, slack period or similar may be used (even Christmas). If that can't be done new tracks may be provided alsewhere and the old ones abandoned or recycled to another use... relocating especially happens when bigger, longer, heavier cars (new) are introduced... no-one wants to damage new cars... the yard tracks may need to be of heavier build and longer to accomodate them as well... this could apply to larger diesels as well as the steam - diesel transition. An alternative is for traffic to be diverted elsewhere while work is carried out... this can make for interesting/unusual traffic moves... and signs of the diverted traffic at the alternative yard as well as clearly new track in the regular yard. then again there's all the MoW equipment... Or you could model the marks of derailed cars... from damaged ties to load spills... even cars lifted off and stood to the side... Rails do get changed but this would be hard to show. Yard rail can be new or cascaded from the main. Cascaded panels might have concrete ties... or even a mix of cascaded concrete ties and replacement wood ties. Cascade rail could mean a track or a length or two of significantly heavier (taller) rail in one or more roads within the yard... this might be what had become the most neglected/worn out road... which might have become overgrown but now be cleaned up because of a growth in work for the yard. Don't forget to give road vehicles room to move about and places - where rail cars won't stand and block them - for road vehicles to cross the tracks. Truck suspensions don't like being bounced across rails... if a temporary crossing is needed ties may be used. HOPE THIS HELPS [8D][8D][8D]
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