2-rail or 3-rail?
With 2-rail, if you have 4-axle diesels and small steam switchers, you can get away with 36" radius (O-72) for your corner which gives more room for the industries to switch. With 3-rail, you can go a bit sharper -- O-63 or O-54,
With either, use numbered turnouts instead of curve-replacements as the appearance will be better. I have a few corner plans I was tinkering around with. They're a little larger than your space, but could probably be cut down.
This first one is 10'4"x10'4" and uses 42" radius (O-84) curves. Main turnouts are #6. Industry turnouts are #4.
![10.4x10.4_90-degree_corner_switching_layout--42-inch_radius 10.4x10.4_90-degree_corner_switching_layout--42-inch_radius](https://ogrforum.com/fileSendAction/fcType/0/fcOid/18746737981342166/filePointer/18746737981680734/fodoid/18746737981680728/imageType/MEDIUM/inlineImage/true/10.4x10.4_90-degree_corner_switching_layout--42-inch_radius.bmp)
This next one is 9'8"x12' with 36" radius curves (O-72)
![11.8x12.0_90-degree_Corner_with_spur--36-inch_radius 11.8x12.0_90-degree_Corner_with_spur--36-inch_radius](https://ogrforum.com/fileSendAction/fcType/0/fcOid/18746737981342166/filePointer/18746737981680735/fodoid/18746737981680729/imageType/MEDIUM/inlineImage/true/11.8x12.0_90-degree_Corner_with_spur--36-inch_radius.bmp)
This next one is 12'x12' and features some street running. Curves are 36" radius. The design plan for this was inclusion into a larger layout at some point.
![12.0x10.8_90-degree_street-running_lead 12.0x10.8_90-degree_street-running_lead](https://ogrforum.com/fileSendAction/fcType/0/fcOid/18746737981342166/filePointer/18746737981680736/fodoid/18746737981680730/imageType/MEDIUM/inlineImage/true/12.0x10.8_90-degree_street-running_lead.bmp)
This one is modeled after Santa Ana Avenue and Olive Street in Anahiem California. All of the industries in the area are gone, but the line is used to reach a group of industries that are South of the area. Size is 12'x12'. Curves are 36" radius (O-72). Turnouts are #4.
![12.0x12.0_90-degree_street-running_lead8--36-inch_radius 12.0x12.0_90-degree_street-running_lead8--36-inch_radius](https://ogrforum.com/fileSendAction/fcType/0/fcOid/18746737981342166/filePointer/18746737981680737/fodoid/18746737981680731/imageType/MEDIUM/inlineImage/true/12.0x12.0_90-degree_street-running_lead8--36-inch_radius.bmp)