As @pjohanneson guesses the overall network is denser but very little is used for passenger traffic. I also suspect that the “capillaries” of sidings and short lines weren’t visible in the older map and are largely gone today. Map from @openrailwaymap @petergleick
@rmartinnielsen@openrailwaymap@petergleick The times I've traveled on Via in Canada, one major component of the experience was waiting for not-insignificant chunks of time for a freight train to pass so that we could continue.