### Research Objectives of the Paper and Contributions  
Based on the reviewed literature on intermodal approaches and the unique characteristics of a ride-pooling service, solutions for other shared mobility services, such as car-sharing services, are insufficient for the problem tackled in this research. This is mainly because for a ride-pooling service, such as the one addressed in this paper, apart from the availability of vehicles, the shareability of the route with other passengers and the satisfaction of all their time-window requirements are crucial and, additionally, the coordination with the public transport schedules must be guaranteed. This implies that current solutions for other kinds of shared services can hardly be applied to an intermodal scenario comprising a ride-pooling service. For the time being, the existing solutions for this specific service comprise only a small picture of the entire intermodal scenario where not all the possible combinations of RP and PT are included. Some of them only test their methods in oversimplified small areas, which do not really help to test the overall performance of such systems in large urban areas where this kind of solution would really make sense.  
Furthermore, they significantly simplify the entities involved in the trip computation. All of the studies examined consider only the nearest vehicle and, with the exception of one, the nearest stop, severely limiting the range of potential trips. It may be the case that another vehicle a little further away may be a better alternative because its tour is more similar to the new request, and so the new customer and the already en-route passengers may benefit from sharing part of the journey. In addition, for the stops, it should be considered that with alternative stops, one may cut the waiting time or the number of transfers, hence reducing travel time.  
Therefore, it is clear that there is a need to continue to study the intermodal problem regarding public transport and ride-pooling services. The efficient interaction of an MaaS system with the public transport network cannot be conceived without the existence of an efficient dispatching system that can deal with a demand of requests of service, which are necessarily spread throughout a (possibly extensive) urban or metropolitan area. In order to be able to evaluate the behaviour of the intermodal ride-pooling system with public transport under such a dispatching system, in this article, its basic parameters have been established (types of requests, preferences, policies, etc.), and a simulator has been developed (an extended version of an ad hoc ride-pooling simulator, to account for the new intermodal use case accounting for public transport and ride-pooling services) that, under these dispatching parameters, has made use as basic tools, on the one hand, of an ad hoc ride-pooling dispatcher, and on the other, of a journey planner for public transport.  
The main components of the proposed system, the simulation model and the dispatching system, are generic and therefore suited to the specific transportation networks of large cities, or metropolitan areas, with a high degree of public transportation coverage, and peripheries or suburban areas poorly served. Thus, the ride-pooling service would be used as a feeder for the stops or exchange hubs providing access to intermodal routes, with the ride-pooling service being used as the first and/or last leg of the trip.