A look at the Codes
Group,
This issue of where we locate our railroads, and how we modify our homes, has always been a concern of mine. Let me remove my model railroad hobbyist hat, and put on my work hat (former building and electrical inspector; now a fire prevention engineer for a metropolitan fire dept.).
First, remember, the Codes are minimum standards. Also, remember that the Codes have been developed over the last 80 years in response to disasters. Each section in the Codes is a response to injury or death. So, they're not just onerous requirements by some bureaucrat.
The building codes look at exiting (code phrase is "means of egress") relative to the activity and the number of people. It is an evaluation of hazard level, and risk to the occupants.
A brief summary:
Bedrooms: 1 or 2 or 3 people in the room, sleeping and not cognizant of their surroundings. Hence, smoke alarms are required, and the emergency egress path (window or door) is required in addition to the regular path out of the bedroom door. This is because a fire in a home with sleeping people will have time to develop (and it only takes a few minutes), and then block the normal egress path.
LKO's google code reference is a good example. Those code references all address emergency egress from sleeping rooms. It is assumed that the regular egress path out the door and down the hall is blocked, so the 5.7 sq.ft. opening at the window allows people an escape path, or, very often, a route for a firefighter in full gear to enter to effect rescue. Our lesson: if your railroad room can be used for sleeping, don't block the emergency egress window; keep it readily accessible.
Storage rooms: The Code assumes that there is normally no one in the room, so there few code requirements. E.G. A door, or access opening, and only a ship's ladder instead of a stair. Our lesson: if it becomes a railroad room, then it's not a storage room, so provide a real egress path, especially if you are ever to invite anyone else into the room. Provide them the means to safely escape in an emergency. Install a full door, and a stairway instead of a ladder. Remember that, in an emergency, people are rushing to get away from the hazard.
Attics: Structurally, most attics are not designed to support more than the weight of one person up there for some maintenance or repair purpose. Egress: see "Storage rooms" above.
What about numbers of people. The Codes all consider 10 people as a maximum on a floor above or below the main story, before an additional exit is required. So, if you have a large railroad, that may have more than 10 operators and/or kibitzers, and it is on the second floor or the basement, provide a second exit with a stairway as the path up or down.
Electrical: The majority of home fires are electrical in origin. For us in a hobby of big electrical users, we need to pay attention to that fact. This can be another major discertation, so let me just say, heat from overloads, shorts, or arcing is your enemy, so provide circuit protection, keep it neat, and seek professional help if you're not sure what''s going on.
A last, simple, safety device: Have a 2A20BC fire extinguisher (or more) in the layout room, work bench, etc. The "A" designation is for wood fires, "2" is a minimum size number; "B" designation is for flammable/combustible liquids, "20" is a minimum size number; and "C" is for electrical fires. My local big box store has 3A40BC size for about $25 bucks.
Thanks for listening to my rant. Stay safe.