/// <summary>
        /// Check to see if there are any related Transmissions, and load them if requested
        /// </summary>
        public static void CheckExpandTransmissions(SqlDataManager sdm, IEnumerable <Telegraph> telegraphs, string expandString)
        {
            var telegraphsWhere = CreateTelegraphWhere(telegraphs);

            expandString = expandString.SafeToString();

            if (String.Equals(expandString, "all", StringComparison.OrdinalIgnoreCase) || expandString.IndexOf("transmissions", StringComparison.OrdinalIgnoreCase) >= 0)
            {
                var childTransmissions = sdm.GetAllTransmissions <Transmission>(telegraphsWhere);

                telegraphs.ToList()
                .ForEach(feTelegraph => feTelegraph.LoadTransmissions(childTransmissions));
            }
        }