In my experience the capacitor is also useful for DC operation because of noisy/dirty wheel axles and track making intermittent or high-resistance contact. Even with a long insulated-section when the consist enters and you're depending on a small number of axles to firmly straddle the outer rails.
It appears All does not have 1 Watt resistors but IMO you don't need that. Resistor Power = current x current x resistance. Since your coil is 0.09 Amps, the 10 ohm resistor will dissipate: 0.09A x 0.09A x 10ohms = 0.1 Watts...so a smaller more economical 1/2 Watt resistor would be fine which All seems to carry. The current of course spikes briefly when turning on but it's the continuous steady current when the relay is closed that drives the dissipated resistor power.
