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This calculator <a href="https://www.cirris.com/learning-center/calculators/133-wire-resistance-calculator-table">https://www.cirris.com/learning-center/calculators/133-wire-resistance-calculator-table</a>   says that 26 AWG wire 12ft long is .49 ohms +.126 ohms = .616 ohms of wire resistance. Rail resistance: <a href="https://www.w8ji.com/track_resistance.htm">https://www.w8ji.com/track_resistance.htm</a>   0.00145 ohm per inch code 100 .00145 x 70" (36" piece of flex track, soldered connections about half inch from end of rail, plus quarter would not be exacty at end of rail) .1015 ohm .616 ohm + .1015 ohm = .7175 ohm +2 unknowns: resistance of connections, at least one of the three is a screw terminal resistance of the 5/8ths inch piece of material used to generate the short circuit.  <a href="https://dccwiki.com/Rail_Size">https://dccwiki.com/Rail_Size</a> this gives slightly different data for rail resistance.
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